Window mullion



FIG. 1 is a perspective view from one side of the window mullion;

FIG. 2 is a perspective view from the other side of the window mullion; and,

FIG. 3 is a perspective view from below the window mullion.

The window mullion is broken away on the end to indicate indeterminate length. 

The ornamental design for a window mullion, as shown and described. 